Levente Rózsa

Formation of magnetic skyrmions with tunable properties in PdFe bilayer deposited on Ir(111)

We perform an extensive study of the spin-configurations in a PdFe bilayer on Ir(111) in terms of ab initio and spin-model calculations. We use the spin-cluster expansion technique to obtain spin model parameters, and solve the Landau-Lifshitz-Gilbert equations at zero temperature. In particular, we focus on effects of layer relaxations and the evolution of the magnetic ground state in an external magnetic field. In the absence of a magnetic field, we find a spin-spiral ground state; while applying an external magnetic field, skyrmions are generated in the system. Based on energy calculations of frozen spin configurations with varying magnetic field we obtain excellent agreement for the phase boundaries with available experiments. We find that the wavelength of spin-spirals and the diameter of skyrmions decrease with increasing inward Fe layer relaxation, which is correlated with the increasing ratio of the nearest-neighbor Dzyaloshinskii-Moriya interaction and the isotropic exchange coupling,

Formation and stability of metastable skyrmionic spin structures with various topologies in an ultrathin film

D/J

Complex magnetic phase diagram and skyrmion lifetime in an ultrathin film from atomistic simulations

. Our results also indicate that the applied field needed to stabilize the skyrmion lattice increases when the diameter of individual skyrmions decreases. Based on our observations, we suggest that the formation of the skyrmion lattice can be tuned by small structural modification of the thin film.

Temperature scaling of the Dzyaloshinsky-Moriya interaction in the spin wave spectrum

We observe metastable localized spin configurations with topological charges ranging from

Langevin spin dynamics based on ab initio calculations: numerical schemes and applications

Q=-3

Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors

to

Spin-polarized scanning tunneling microscopy characteristics of skyrmionic spin structures exhibiting various topologies

Q=2

Magnetic phase diagram of an Fe monolayer on W(110) and Ta(110) surfaces based on ab initio calculations

in a (Pt

Relativistic and thermal effects on the magnon spectrum of a ferromagnetic monolayer.

_{0.95}

Inducing skyrmions in ultrathin Fe films by hydrogen exposure

Ir